Materials Literature
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TiO2 nanoparticles modified by DTMS are prepared by the liquid phase deposition method. The influence of modifying temperature and time,and the content of silane coupling agent on the surface modification are studied. The TiO2 nanoparticles are characterized by FT-IR,and TEM. The results show that the highest lipophil…
A new kind of terminated polyether modified silicone surfactant(TPESS) was synthesized by hydrosilylation of the bis-dimethylhydrogen siloxyl-terminated polydimethylsiloxane(PHMS) with allylpolyoxyethylene ether(FAE-10) in the presence of a platinum catalyst.The optimum experimental conditions were studied.The experim…
12%Cr heat-resistant steel used in the ultra supercritical set blade was quenched and tempered by vacuum heat treatment furnace,whose room temperature mechanical properties and metallographic structure supply the specific requirements.However,the high-temperature short-time lasting performance generates the dispersion…
The intrinsic relationship between molecular chain length and the probability of chain reaction during poly(lactic acid)(PLA) hydrolysis was investigated by Monte Carlo simulation. The chain reaction rate was calculated by introducing a power function of different molecular chain lengths. The hydrolysis of both amorph…
Tests to contrast Graft clothing made abroad and Great White Shark clothing made in China were conducted.By a traditional way,the qualities of sliver and yarn produced by these two kinds of clothing were examined.It was found that the overall qualities of sliver and yarn produced by the Great White Shark clothing was…
Cold metal transfer(CMT) is a new technology of metal inert gas welding in which numerical power supply and precise process control technology is adopted.With this technology,welding heat imput can be reduced significantly,so welding residual stress and welding deforming are moderated.In this paper,through CMT welding…
Chemical washings of pigment yarn-dyed denim with four methods of hydrogen peroxide washing(H2O2 bleaching),hypochlorite washing(NaClO bleaching),potassium permanganate washing(KMnO4 bleaching) and cellulase washing(enzyme bleaching)are carried out.Effects of washing methods on K/S value,air permeability,breaking stre…
Using the pulse electroacoustic(PEA) method,we investigated accumulation characteristics of space charge and influential factors(mass fraction of water and temperature) in oil-impregnated thick pressboards(0.5~2 mm thick) under low electrical field values(5 kV/mm).Moreover,we adopted the thermoelectric stimulated curr…
The geometrical configuration of(AP)Ge(Ⅱ) complex is optimized at B3LYP/6-31+G(d) level based on a density functional theory(DFT) method.The atomic charge distribution is determined through the natural bond orbital(NBO) analyses.Frontier molecular orbits and IR spectrum of the(AP)Ge(Ⅱ) compound are discussed,respectiv…
The workpiece was processed with salt bath nitriding(QPQ) for 1.5 hours at high temperature of 645 ℃,then treated through different temperature oxidation,at the temperature of seven selected temperatures between 225 ℃ and 420 ℃.The surface hardness data of the sample was obtained:the surface hardness improved at lower…
To monitor the curing process of HTPB liner in real-time,ultrasonic longitudinal wave reflection technology and infrared spectroscopy were adopted. Liner curing state was characterized by the change of longitudinal wave velocity,acoustic attenuation coefficient and curing degree determined by infrared spectroscopy. Th…
The calcium stearate product was synthesized directly by one-step of stearic acid and calcium hydroxide in the state of aqueous medium in the ordinary pressure reaction pot by certain production precess.The producing experiment showed that the reaction speed was affected by factors like the purity and fineness of calc…
The microwave drying principle,mass transfer process and heat transfer process were studied.The different wool tops were dried in the microwave drier and the experiment results were analysized.According to the technology experiment,which indicate that the microwave drying technology can be used to drying wool tops.Aft…
Acrylic acid was grafted onto cellulose respectively in ionic liquids([Amim]Cl) and NaOH / Urea aqueous solution by using ammonium persulfate as an initiator in the presence of N,N'-methylenebisacrylamide as a crosslinker under graft copolymerization method.The spherical polymer was obtained by using light liquid para…
Ionic liquid 1-( 4-sulfonic acid)-butyl-3-methylimidazolium hydrogen sulfate( IL-1) was used as a catalyst; metal chlorides were used as promoter to catalyze the hydrolysis of cellulose. Also,IL-1 was used to dissolve cellulose in sawdust and cellulose regeneration. Influence of temperature,alkali concentration and ti…
The magnesium oxysulfate cement was preparated by using MgSO4 instead of MgCl2.The new cementitious materials was researched and Its strength and water resistance were better than magnesium oxychloride cement,and discussed the performance of modified magnesia material.The results showed that: water resistance of magne…
Based on matrix analysis methods,an accurate equivalent circuit model of a 2-dimentional(2-D) eddy-current magnetic field coupled with stranded windings and solid conductors is developed by using loop method and nodal method separately.The formulas of impedance computation and the formulas of the total power loss comp…
An extrusion die was designed for an aluminum gear and a finite element analysis model was built in which the steady-state flow of extruded metal was obtained and the distribution of velocity,stress and displacement were studied.Based on the numerical simulation results,a modification scheme was proposed in which the…
A novel heat-retardant epoxy resin,hexa(4-glycidoxyphenoxy) cyclotriphosphazene(HCPEP) was prepared by the reaction of epichlorohydrin with hexa(4-hydroxyphenoxy) cyclotriphosphazene.The structure was characterized by fourier transform infrared,31P NMR,13C NMR,1H NMR spectroscopy and elemental analysis.The epoxy resin…
The mullite powders are prepared through solid-state reaction of manufactured alumina and silica fume in air atmosphere. The influences of calcination temperature and different Al2 O3 /SiO2 ratios of the amount of substance on the crystalline phases are discussed. The results show that the powder has the maximum mulli…